What similar functions do the protonephridia of flatworms and the nephridia of roundworms have in common with each other?

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    Almost none; the species are too different.
    Both act to filter out wastes for subsequent excretion.
    Both act to filter out nutrients to retain them inside the body.
    Both the second and third answers are correct.
    none of the above

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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Both the second and third answers are correct.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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